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| Number | Title | Issue Date |
| 8178064 | Treatment of power utilities exhaust Provided is a process for treating nitrogen oxide-containing exhaust produced by a stationary combustion source by the catalytic reduction of nitrogen oxide in the presence of a reductant comprising hydrogen, followed by ammonia selective catalytic reduction to furt... | 05/15/2012 |
| 8142747 | Catalytic reduction of NO A system for NOx reduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO2, a particulate filter, a source of reductant such as NH3 and an SCR catalys... | 03/27/2012 |
| 8114369 | Catalyst containing platinum and palladium for the selective reduction of NOx with hydrogen (H2-SCR) The invention relates to a novel catalyst having excellent activity and selectivity for reducing nitric oxides (NO/NO2) to nitrogen gas (N2) with hydrogen (H2) being used as a reducing agent under strongly oxidizing conditions (e.g.,... | 02/14/2012 |
| 8075859 | Nanocomposite particle and process of preparing the same A nanocomposite particle, its use as a catalyst, and a method of making it are disclosed. The nanocomposite particle comprises titanium dioxide nanoparticles, metal oxide nanoparticles, and a surface stabilizer. The metal oxide nanoparticles are formed hydrothermall... | 12/13/2011 |
| 8062618 | Exhaust aftertreatment system and method of treating exhaust gas A diesel exhaust aftertreatment system and method are provided. The system includes a lean NOx trap for reducing NOx and a transition metal-exchanged zeolite booster catalyst positioned downstream from the lean NOx trap for further r... | 11/22/2011 |
| 8052950 | Multi-compartment overfire air and N-agent injection method for nitrogen oxide reduction in flue gas A method of decreasing a concentration of nitrogen oxides in a combustion gas flowing through a vessel including: generating a flue gas in a combustion zone of the vessel, the flue gas containing nitrogen oxides and carbon monoxide; providing overfire air into a bur... | 11/08/2011 |
| 8043590 | Catalytic reduction of NO A system for NOx reduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO2, a particulate filter, a source of reductant such as NH3 and an SCR catalys... | 10/25/2011 |
| 8007750 | Multilayered catalyst compositions A layered, three-way conversion catalyst having the capability of simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides is disclosed. Methods of making and using the same are also provided. In one or more em... | 08/30/2011 |
| 7998445 | Method and apparatus for the treatment of nitrogen oxides using an ozone and catalyst hybrid system The present invention is a method of treating nitrogen oxides using an ozone and catalyst hybrid system, as well as an apparatus, specifically relating to a method of treating nitrogen oxide using an ozone and catalyst hybrid system comprising: 1)removing moisture f... | 08/16/2011 |
| 7993617 | Alkali resistant catalyst The present invention concerns the selective removal of nitrogen oxides (NOx) from gasses. In particular, the invention concerns a process, a catalyst and the use of a catalyst for the selective removal of nitrogen oxides in the presence of ammonia from gases contai... | 08/09/2011 |
| 7988940 | Selective catalytic reduction system and process for treating NOx emissions using a zinc or titanium promoted palladium-zirconium catalyst A process and system (18) for reducing NOx in a gas using hydrogen as a reducing agent is provided. The process comprises contacting the gas stream (29) with a catalyst system (38) comprising sulfated zirconia washcoat particles (4... | 08/02/2011 |
| 7985391 | Non-zeolite base metal SCR catalyst A method of converting nitrogen oxides in a gas stream to nitrogen comprises contacting the nitrogen oxides with a nitrogenous reducing agent in the presence of a non-zeolite base metal catalyst consisting of: (a) at least one transition metal dispersed on a mixed o... | 07/26/2011 |
| 7976805 | Selective catalytic reduction system and process for treating NOx emissions using a palladium and rhodium or ruthenium catalyst A process for the catalytic reduction of nitrogen oxides (NOx) in a gas stream (29) in the presence of H2 is provided. The process comprises contacting the gas stream with a catalyst system (38) comprising zirconia-silica washcoat particles ... | 07/12/2011 |
| 7976804 | Method for the decomposition of NO in the Ostwald process A catalyst for the decomposition of N2O under the conditions of the Ostwald process, comprising a carrier and a coating made of rhodium, rhodium/palladium or rhodium oxide applied thereto, ensures to yield NO with a particularly low content of laughing ga... | 07/12/2011 |
| 7972581 | Method of treating nitrogen oxide-containing gas First, the emission amount of nitrogen oxides can be decreased close to zero as much as possible, and the emission amount of carbon monoxide is decreased to a permissible range. Second, energy saving by combustion at a low air ratio close to 1.0 is realized. Third, ... | 07/05/2011 |
| 7947241 | Aqueous solution for the treatment of exhaust gases of diesel engines The present application relates to the use of a solution for the treatment of exhaust gases at the outlet of on-board or stationary diesel engines. It also relates to its use in any device for the treatment of these exhaust gases, regardless of whether the engines a... | 05/24/2011 |
| 7824636 | Model-based tuning of ammonia distribution and control for reduced operating cost of selective catalytic reduction A method and system for reducing the amount of nitrogen oxides (NOx) in a combustion gas waste stream by (1) analyzing the waste stream to determine the amount of NOx; (2) determining the stoichiometric amount of ammonia required to reduce the ... | 11/02/2010 |
| 7815881 | Selective catalytic reduction of NOenabled by urea decomposition heat-exchanger bypass Disclosed are a process and apparatus for selective catalytic reduction of NOx. The process is enabled by bypassing a heat exchanger section, such as an economizer, of the boiler in advance of an SCR unit at low load conditions to enable NOx re... | 10/19/2010 |
| 7803338 | Method and apparatus for combination catalyst for reduction of NOin combustion products A method and apparatus for catalytically processing a gas stream passing therethrough to reduce the presence of NOx therein, wherein the apparatus includes a first catalyst composed of a silver containing alumina that is adapted for catalytically processi... | 09/28/2010 |
| 7785551 | Ammonia SCR catalyst and method of using the catalyst A catalyst and a method for selectively reducing nitrogen oxides with ammonia are provided. The catalyst includes a first component of copper, chromium, cobalt, nickel, manganese, iron, niobium, or mixtures thereof, a second component of cerium, a lanthanide, a mixt... | 08/31/2010 |
| 7776297 | Multi-stage heat absorbing reactor and process for SCR or NOx and for oxidation of elemental mercury A selective catalytic reduction apparatus has at least first and last catalyst layers in series for reducing nitrogen oxides in a flue gas, at least one interstage heat exchanger located after the first layer and before the last layer, that lowers flue gas temperatu... | 08/17/2010 |
| 7763222 | Exhaust gas purifying system An exhaust gas purifying system has a honeycomb filter including a porous partition wall having a number of pores arranged so that a plurality of cells communicating between two end faces are formed, and a plugging portion disposed in either of the end faces or insi... | 07/27/2010 |
| 7744839 | Method for reducing the nitrogen oxide concentration in gases The method comprises passing an N2O- and NOx-containing gas over a sequence of two catalyst beds, adding reducing agents for NOx and for N2O between the catalyst beds in such an amount that not only NOx but also... | 06/29/2010 |
| 7744840 | Selective catalytic reduction system and process using a pre-sulfated zirconia binder A selective catalytic reduction (SCR) process with a palladium catalyst for reducing NOx in a gas, using hydrogen as a reducing agent is provided. The process comprises contacting the gas stream with a catalyst system, the catalyst system comprising (ZrO2... | 06/29/2010 |
| 7736608 | Methods and systems for reducing the emissions from combustion gases A method for reducing the emissions from combustion gases produced during a combustion process includes injecting a hydrocarbon-based reducing agent into the combustion gases to form a combustion gas mixture. The combustion gas mixture including oxides of nitrogen, ... | 06/15/2010 |
| 7722845 | Bifunctional catalysts for selective ammonia oxidation Catalysts, methods, and systems for treating diesel engine exhaust streams are described. In one or more embodiments, the catalyst comprises platinum, a second metal from one of the groups VB, VIB, VIIB, VIIIB, IB, or IIB of the periodic table, a refractory metal ox... | 05/25/2010 |
| 7722844 | Exhaust smoke denitrating apparatus and method of exhaust smoke denitration An exhaust smoke denitrating apparatus in which using an NH3 injection unit, compressed air is fed from blower to ejector for extracting of exhaust gas from HRSG1, and with thus obtained mixed gas, NH3-containing gas is produced from NH3 | 05/25/2010 |
| 7718153 | Catalytic process for control of NOemissions using hydrogen A selective catalytic reduction process with a palladium catalyst for reducing NOx in a gas, using hydrogen as a reducing agent. A zirconium sulfate (ZrO2)SO4 catalyst support material with about 0.01-2.0 wt. % Pd is applied to a catalytic bed ... | 05/18/2010 |
| 7682583 | Lean NOtrap/conversion catalyst A process and composition for converting nitrogen oxides present in exhaust gases produced by an internal combustion engine utilize cobalt and at least one alkali metal or alkaline earth metal as a component of an adsorbent. The process involves contacting the exhau... | 03/23/2010 |
| 7666376 | Diesel particulate filter comprising a finely dispersed diesel particulate catalyst The invention relates to a device for the, (in particular continuous), oxidation of particulates from the exhaust gases of diesel motors. Said device consists of an open-pored body as a particle filter, on whose surface an oxidation catalyst is finely dispersed. The... | 02/23/2010 |
| 7655204 | Heat-treated active carbons for use in denitration, processes for producing same, denitration method using same, and denitration system using same This invention relates to a technique for removing nitrogen oxides (NOx) present in exhaust gases discharged from boilers and the like. When the temperature of the exhaust gas is 100° C. or below, a heat-treated active carbon produced by heat-treating a ... | 02/02/2010 |
| 7638107 | Multi-bed selective catalytic reduction system A multi-bed selective catalytic reduction system comprising a gas input duct, a first ammonia injection grid assembly located downstream from the gas input duct, a first selective catalytic reduction catalyst assembly located downstream from the first ammonia inject... | 12/29/2009 |
| 7628968 | High activity titania supported metal oxide DeNOx catalysts The present invention is directed to high activity titanium oxide DeNOx catalysts. In preferred embodinents, by depositing vanadium oxide on a titania supported metal oxide such as tungsten oxide, an improved catalyst may be generated. This catalyst may be used in t... | 12/08/2009 |
| 7628967 | Removal of Hg, NO, and SOwith using oxidants and staged gas/liquid contact A method of scrubbing mercury compounds and nitrogen oxides from a gas stream employing a scrubbing operation. The method involves the contact of the stream which contains mercury, SOx and NOx compounds with a sorbent to remove at least a porti... | 12/08/2009 |
| 7615200 | Selective catalytic reduction of NOenabled by urea decomposition in heat-exchanger bypass Disclosed are a process and apparatus for selective catalytic reduction of NOx. The process is enabled by passing a heat exchanger section, such as an economizer, of the boiler in advance of an SCR unit at low load conditions to enable NOx redu... | 11/10/2009 |
| 7608232 | Treatment method and treatment apparatus for gas containing nitrous oxide Nitrous oxide-containing gas is subjected to heat exchange with decomposed gas from a nitrous oxide decomposition catalyst-filled reactor and then contacted with a heater comprising integrally formed heating unit and baffles, wherein gaps are formed between the baff... | 10/27/2009 |
| 7601316 | Method of reducing NOx and particulates from internal combustion engines Oxides of nitrogen are adsorbed onto the surfaces of, and particulates are trapped in, pores of channels (130, 133, 139-151) in a porous, interdigitated ceramic particulate filter (57, 100) that has relative rotation with respect to a gas inlet ... | 10/13/2009 |
| 7588742 | Purification of a mixture of H/CO by catalysis of the NOx The invention relates to a method for purifying a gas flow containing hydrogen (H2) and carbon monoxide (CO), in addition to at least one nitrogen oxide (NOx), as impurities. According to said method, the gaseous flow is brought into contact with at least one cataly... | 09/15/2009 |
| 7563423 | Method and apparatus for catalyst regeneration The present invention relates to the regeneration of a SOx removal catalyst (14) and a NOx reducing catalyst (12). Additionally, this invention relates to the reduction or elimination of sulfur breakthrough from the SOx removal catalyst (14) to ... | 07/21/2009 |
| 7527776 | Ammonia SCR catalyst and method of using the catalyst A catalyst and a method for selectively reducing nitrogen oxides with ammonia are provided. The catalyst includes a first component of copper, chromium, cobalt, nickel, manganese, iron, niobium, or mixtures thereof, a second component of cerium, a lanthanide, a mixt... | 05/05/2009 |
